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The video ends with the slogan: "Exploitation. It's not OK here. It's not OK anywhere."

Murray Worth, War on Want spokesman, told Marketing Magazine that adidas had 775,000 workers making products in 1,200 factories in 65 factories.

He said: "What's really shocking is at a time they are spending £100 million alone on the sponsorship deal with the Olympics, never mind the additional deals with the athletes, that similar amounts of money are not being spent on real improvements in workers' rights.

"One of the main things we hope to get out of it is to raise awareness of the labour rights abuses that happen behind clothes on the high street.

"I think it's something we often think is down to particularly bad brands or associated with cheap clothing rather than something that is quite widespread."

Earlier this year, Stella McCartney and adidas unveiled Team GB's kit for the Games next month.

Christine Ohuruogu, Jody Cundy, Ellie Simmonds, Shanzae Reade, Phillips Idowu, Jessica Ennis, Louis Smith, Jonnie Peacock and Denise Marston-Smith unveil the British Team Kit designed by Stella McCartney during a photocall at the Tower of London

The company has previously been accused of enforcing long hours on its workers, from 8am to 11pm in China.

In response, Adidas said its factories had applied for and received government approval for "Comprehensive Working Hours", which allows for extended overtime for specific periods.

It also said it operated a voluntary overtime system, allowing workers to take leave or refuse extra hours.

Adidas said it had tried to speak to War on Want about the allegations but had yet to receive a response.

It added: "The adidas Group is fully committed to protecting worker rights and to ensuring fair and safe working conditions in factories throughout our global supply chain.

"However, we take all allegations about working conditions extremely seriously and will investigate any new claims immediately.

"But it is very important to note that we found no evidence to support claims made in a previous War on Want report about factory conditions in Bangladesh.

"In fact, the report contained several inaccuracies, including the suggestion that adidas manufactures 2012 Olympic products in Bangladesh, which we absolutely do not."